技术路径
从基础到可运行的应用。每条路径都是人工策划而非自动生成：两项技术之间最短的路，通常并不是值得学的那条。
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From machine learning to the Transformer
The conceptual ladder. Each rung exists because the one below it was not enough for the problems people actually had.
Machine Learning → Neural Network → Deep Learning → Attention → Transformer
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From the Transformer to a RAG application
The path the PRD names: how the architecture underneath becomes an application that answers from your own documents.
Transformer → LLM → RAG → Qdrant
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From raw text to retrieval
The retrieval half on its own, which is where the quality of a RAG system is actually decided.
Tokenization → Embedding → Qdrant → Reranking
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Adapting a model to your data
How to specialise a general model without paying to retrain it, and why that became possible.
Transformer → LLM → Fine-tuning → LoRA